Pd doping-weakened intermediate adsorption to promote electrocatalytic nitrate reduction on TiO₂ nanoarrays for ammonia production and energy supply with zinc–nitrate batteries

Abstract

(Photo)Electrochemical nitrogen reduction for ammonia (NH3) production is an appealing alternative to the traditional high-energy Haber-Bosch reaction. However, the future of this approach is bleak because of the ultralow N2...

Ambient Ammonia Synthesis via Electrochemical Reduction of Nitrate Enabled by NiCo2O4 Nanowire Array

“…eNO 3 RR can be considered as a series of deoxidation and hydrogenation reactions. [46,47] The free energy diagram of the eNO 3 RR on the NiCo 2 O 4 (311) surface is presented in Figure 3a, and the atomic configurations of the relevant intermediates is shown in Figure S30 (Supporting Information). We can see that all the reaction steps are exothermic, except the transition of NO 2 * to NO* with a free energy uphill of 0.20 eV.…”

Co–NCNT nanohybrid as a highly active catalyst for the electroreduction of nitrate to ammonia

“…22,23 There is a great need to find efficient electrocatalysts for the NO 3 À reduction reaction (NO 3 RR) for selective NH 3 synthesis. Recent studies show that noble metal materials are active for NO 3 RR, [24][25][26][27][28][29] but high costs and scarce reserves restrict their industrial-scale application. As a result, research interest has shifted towards developing non-noble metal electrocatalysts 32 for NO 3 À electroreduction.…”

Nitrate‐to‐Ammonia Conversion on Ru/Ni Hydroxide Hybrid through Zinc‐Nitrate Fuel Cell

“…Based on this analysis, anode reaction with a more negative standard reduction potential (SRP, Table S1, Supporting Information) is essential, which can be satisfied by a series of metals as listed in the SRP. Zinc (Zn) has been selected to construct the fuel cell for the concept demonstration, [ 24 ] with further consideration of cost and stability in basic solution as illustrated by our patent and Guo's resent work. [ 24,25 ] Specifically, it offers a reduction potential of −1.26 V versus NHE, i.e normal hydrogen electrode (pH14, Equation ()), achieving theoretical energy density E theo = 910 Wh Kg –1 with NO 3 – feedstock converted to NH 4 + (pH14), which can be even higher (as high as to 1754 Wh Kg –1 ) if coupled with lower cathode chamber pHs (detailed in the Supporting Information and Table S2, Supporting Information).…”